New criteria for selecting reliable Thellier-type paleointensity results from the 1960 Kilauea lava flows, Hawaii
New criteria for selecting reliable Thellier-type paleointensity results from the 1960 Kilauea lava flows, Hawaii
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从 1960 年夏威夷基拉韦厄熔岩流中选择可靠的泰勒型古强度结果的新标准
DOI：
10.1186/s40623-021-01473-6
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发表时间：
2021-07
影响因子：
3
通讯作者：
Qin Huafeng
中科院分区：
文献类型：
--
作者：
Jeong Doohee;Liu Qingsong;Yamamoto Yuhji;Yu Yongjae;Zhao Xiang;Qin Huafeng
与部分热剩余磁化检查相关的较高类型的古强度实验已被广泛用于从火山和考古介质中确定古强度值。然而，先前的研究表明，相当大一部分古强度结果与历史熔岩样本的阳性对照在很大程度上无法预测已知的地球磁场强值。为了确定古强度值的保真度，对1960年喷发的基拉韦厄熔岩流进行了常规的Thellier类型的古强度实验。我们的结果的正部分热剩余磁化检查范围为30.28 ± 1.38µT到52.94 ± 1.89µT，这强烈表明常规的古强度检查不能保证古强度结果的保真度，特别是当新形成的磁性粒子的解锁温度高于处理温度时。因此，在本研究中，为了检查加热过程中的热变化，还测量了在室温下测量的热处理样品的滞后参数的温度依赖性。我们的新结果表明，几乎所有偏置的古强度值都对应于>； 3的剩磁矫顽力与磁矫顽力的比值和化学蚀变指数>；~ 10%，这表明磁化状态和热蚀变对古强度结果的保真度有很大影响。我们的研究为进一步提高古强度估算的保真度提供了可行的标准。
Thellier-type paleointensity experiments associated with partial thermal remanent magnetization checks have been widely used to determine paleointensity values from volcanic and archaeological media. However, previous studies have revealed that a substantial portion of paleointensity results with positive checks for historical lava samples largely fails to predict known Earth magnetic field intensity values. To determine the fidelity of paleointensity values, conventional Thellier-type paleointensity experiments were performed on Kilauea lava flows that erupted in 1960. The positive partial thermal remanent magnetization checks for our results range from 30.28 ± 1.38 µT to 52.94 ± 1.89 µT. This strongly indicates that conventional paleointensity checks cannot guarantee the fidelity of paleointensity results, especially when the unblocking temperatures for the newly formed magnetic particles are higher than the treatment temperature. Therefore, in this study, to check for thermal alteration during heating, the temperature dependence of the hysteresis parameter measured at room temperature for the thermally treated samples was also measured. Our new results show that nearly all biased paleointensity values correspond to a ratio of the coercivity of remanence to the magnetic coercivity of > 3 and a chemical alteration index > ~ 10%, which indicates the strong effect of the domain state and thermal alteration on the fidelity of the paleointensity results. Our study provides feasible criteria to further improve the fidelity of paleointensity estimations.
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影响因子：
2.3
作者：
Cromwell, G.;Tauxe, L.;Ron, H.
通讯作者：
Ron, H.
影响因子：
--
作者：
Yongjae Yu
通讯作者：
Yongjae Yu
影响因子：
--
作者：
COE, RS;GROMME, S;MANKINEN, EA
通讯作者：
MANKINEN, EA
DOI：
10.1016/s0031-9201(01)00243-6
发表时间：
2001-10-01
影响因子：
2.3
作者：
Dunlop, DJ;Özdemir, Ö
通讯作者：
Özdemir, Ö
影响因子：
3.7
作者：
L. Tauxe;H. Staudigel
通讯作者：
L. Tauxe;H. Staudigel